Yanni is sitting in the stands watching a football game. the quarterback runs forward toward the end zone and throws a pass straight downfield to a player for a touchdown. the quarterback ran at a speed of 8 m/s and threw the ball with a speed of 15 m/s. which statement is supported by this scenario? a. for yanni, the speed of the ball is 23 m/s, and for the quarterback, the speed of the ball is 15 m/s. b. for yanni, the speed of the ball is 15 m/s, and for the quarterback, the speed of the ball is 8 m/s. c. for both yanni and the quarterback, the speed of the ball is 23 m/s. d. for both yanni and the quarterback, the speed of the ball is 15 m/s.

From the quarterback's point of view, the ball is at first at rest and then it gets thrown with a speed of 15m/s.
From Yanni's point of view, the ball is moving at a speed of 8m/s with the quarterback and then it is thrown with a speed of other 15m/s, which means 15+8=23m/s.
Therefore, the correct answer is A) For Yanni, the speed of the ball is 23 m/s, and for the quarterback, the speed of the ball is 15 m/s.

Acetic acid  /əˈsiːtɪk/, systematically named  ethanoic acid  /ˌɛθəˈnoʊɪk/, is a colourless liquid  organic compound  with the  chemical formula  ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called  glacial acetic acid.  vinegar  is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to  polyvinyl acetate  and  cellulose acetate. it is classified as a  weak acid  since it only partially  dissociates  in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7  3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366  chemblchembl539  chemspider171  drugbankdb03166  echa infocard100.000.528ec number200-580-7e numbere260  (preservatives)gmelin reference1380iuphar/bps1058keggd00010  meshacetic+acidpubchem  cid176rtecs numberaf1225000uniiq40q9n063p  un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4)  key:   qtbsbxvteameqo-uhfffaoysa-n  smilescc(o)=o